Antenna RF Cable Routing Over Ground Pattern
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Solution Overview
Problem
In electronic devices with limited space, the arrangement of multiple antennas for spatial diversity and MIMO applications is hindered by RF cables, which can cause resonant frequency shifts and reduced antenna efficiency due to unnecessary resonance.
Innovation Solution
The antenna apparatus includes a dual-band and a single-band antenna unit arranged alongside a ground pattern, with RF cables routed parallel to each other, allowing the first RF cable to pass over the ground pattern without intersecting the second antenna unit, thereby minimizing the influence of RF cables on the second antenna unit and preventing resonant frequency shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are arranged side by side in limited space, then spatial diversity and MIMO functionality are achieved, but RF cables routed from one antenna inevitably pass near or on other antennas causing resonant frequency shifts and reduced antenna efficiency
Solution Approach 1:
The patent utilizes the housing thickness dimension (Z-axis) to route RF cables through the housing thickness direction, allowing cables to pass underneath antenna elements rather than alongside them in the planar view. This dimensional transition resolves the cable-antenna interference problem while maintaining compact spatial arrangement of multiple antennas for MIMO functionality.
Solution Approach 2:
The patent divides the housing into multiple layers or levels, placing antenna elements in one layer and routing RF cables in a different layer (through the housing thickness). This segmentation separates the cable pathways from antenna elements, eliminating unwanted coupling and resonant frequency shifts while preserving antenna performance.
2Volume of moving object
If housing thickness is reduced and circuit components are densely packed, then device compactness is improved, but available space for accommodating antenna apparatus is reduced
Solution Approach 1:
The patent exploits the housing thickness dimension to accommodate RF cable routing, effectively utilizing the Z-axis space that would otherwise be unused. This allows multiple antennas to be arranged in a compact planar configuration while cables are routed through the thickness direction, achieving both device compactness and sufficient antenna apparatus accommodation.
Solution Approach 2:
The patent nests the RF cable routing path within the housing thickness, placing cables in the vertical dimension while antennas occupy the horizontal plane. This nested arrangement maximizes space utilization, allowing compact device design without compromising antenna system performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves frequency characteristics and radiation efficiency by suppressing unnecessary resonance and resonant frequency shifts, enhancing performance even in space-constrained environments.
Implementation Method 1
a first antenna unit which resonates in a first frequency band and a second frequency band, and a second antenna unit which resonates in the second frequency band
Implementation Method 2
a ground pattern which forms a ground potential
Implementation Method 3
a first RF cable configured to connect the first antenna unit and the radio circuit unit, and a second RF cable configured to connect the second antenna unit and the radio circuit unit
Data Source
AI summary
According to one embodiment, an antenna apparatus includes a first antenna unit disposed along a side of a ground pattern, a second antenna unit disposed along the side of the ground pattern so as to be juxtaposed with the first antenna unit, a first RF cable configured to connect the first antenna unit and the radio circuit unit, and a second RF cable configured to connect the second antenna unit and the radio circuit unit. The first RF cable and the second RF cable are routed from the first antenna unit and the second antenna unit in an arrangement direction of the first antenna unit and the second antenna unit so as to be parallel to each other, with the first RF cable being disposed so as to pass over the ground pattern.